System Analysis and Design
A square symbols

defines a source or destination of system data
None of these
identifies data flow
represents a process that transforms incoming data flow(s) into outgoing data flows
is a data store-data at rest, or a temporary repository of data

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System Analysis and Design
Advantages of Relational Database Management systems are

All of these
Data independence since it allows the database to grow by adding new attributes and relations.
Security controls can be more easily implemented.
Flexibility, of relating different logical files
None of these

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